Hoss is one of very few brands of Glass-On-Glass fitting downstems that measure with the overall length (or more like the distance from TOP of joint to bottom tip of stem) which seems from our measurements to be about 2cm longer than the normal measuring method of bottom-of-joint-to-tip gives. So, the 10cm HOSS measurement here represents the equivalent of 8cm in our normal measuring method (bottom of ground-glass joint to bottom tip of downstem).